diff --git a/packages/ui-default/components/highlighter/highlighter.page.styl b/packages/ui-default/components/highlighter/highlighter.page.styl
index 0df508732..9fd2deaa6 100644
--- a/packages/ui-default/components/highlighter/highlighter.page.styl
+++ b/packages/ui-default/components/highlighter/highlighter.page.styl
@@ -57,6 +57,12 @@ code
     border-radius: 0px !important
     background: none !important
 
+.scratchpad-fill-button
+  display: none
+
+.mode--scratchpad .scratchpad-fill-button
+  display: inline-block
+
 .token.tab:not(:empty),
 .token.cr,
 .token.lf,
diff --git a/packages/ui-default/components/highlighter/highlighter.page.ts b/packages/ui-default/components/highlighter/highlighter.page.ts
index 4b051d64a..da19c9cd2 100644
--- a/packages/ui-default/components/highlighter/highlighter.page.ts
+++ b/packages/ui-default/components/highlighter/highlighter.page.ts
@@ -1,4 +1,5 @@
 import $ from 'jquery';
+import Notification from 'vj/components/notification';
 import { AutoloadPage } from 'vj/misc/Page';
 import { i18n, tpl } from 'vj/utils';
 
@@ -33,6 +34,31 @@ const highlighterPage = new AutoloadPage('highlighterPage', () => {
               $output.parent().prepend($(tpl`<h2>${i18n('Sample Output')} ${id}</h2>`))
                 .addClass('medium-6 columns sample').appendTo($c);
             }
+            if ($root.find('.scratchpad-fill-button').length) return;
+            const $toolbar = $root.find('.toolbar');
+            const $button = $(tpl`
+              <div class="toolbar-item scratchpad-fill-button">
+                <a href="javascript:;">${i18n('Fill to Pretest')}</a>
+              </div>
+            `);
+            $button.on('click', (e) => {
+              const store = (window as any).store;
+              if (!store) return;
+              e.preventDefault();
+              try {
+                store.dispatch({
+                  type: 'SCRATCHPAD_PRETEST_DATA_CHANGE',
+                  payload: {
+                    type: 'input',
+                    value: $code.text(),
+                  },
+                });
+                Notification.success(i18n('Input filled to pretest!'), 2000);
+              } catch (err) {
+                Notification.error(i18n('Failed to fill input'));
+              }
+            });
+            $toolbar.append($button);
           }
         }
       });
diff --git a/packages/ui-default/locales/zh.yaml b/packages/ui-default/locales/zh.yaml
index 86f8dbc71..154c82ca4 100644
--- a/packages/ui-default/locales/zh.yaml
+++ b/packages/ui-default/locales/zh.yaml
@@ -407,6 +407,7 @@ File uploaded successfully.: 上传文件成功
 File: 文件
 Filename: 文件名
 Files: 文件
+Fill to Pretest: 填充到自测
 Filter: 过滤
 First of Contest: 全场一血 
 First of Problem: 题目一血